curl --request POST \
  --url {schemes}://api.upsun.com/organizations/{organization_id}/members \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "permissions": []
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organization_id": "<string>",
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "permissions": [],
  "owner": true,
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "_links": {
    "self": {
      "href": "<string>"
    },
    "update": {
      "href": "<string>",
      "method": "<string>"
    },
    "delete": {
      "href": "<string>",
      "method": "<string>"
    }
  }
}